Ncert Exercises & Solutions

Question 13.14:-

In the alkane H3C – CH2 – C(CH3)2 – CH2 – CH(CH3)2, identify 1°,2°,3° carbon atoms, and give the number of H atoms bonded to each one of these.

H - {C^{1 °}}_{\underset{H}{|}}^{\overset{H}{|}} - \overset{\overset{H}{|}}{\underset{\underset{H}{|}}{C^{2 °}}} - \overset{\overset{\overset{1}{C H_{3}}}{|}}{\underset{\underset{H}{|}}{C^{3 °}}} - \overset{\overset{H}{|}}{\underset{\underset{H}{|}}{C^{2 °}}} - \overset{\overset{H}{|}}{\underset{\underset{H}{|}}{C^{4 °}}} - H

1° carbon atoms are those which are bonded to only one carbon atom i.e., they have only one carbon atom as their neighbour. The given structure has five 1° carbon atoms and fifteen hydrogen atoms attached to it.

2° carbon atoms are those which are bonded to two carbon atoms i.e., they have two carbon atoms as their neighbours. The given structure has two 2° carbon atoms and four hydrogen atoms attached to it.

3° carbon atoms are those which are bonded to three carbon atoms i.e., they have three carbon atoms as their neighbours. The given structure has one 3° carbon atom and only one hydrogen atom is attached to it.

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